Aon has posted a 5% decline in third-quarter net profit after currency movements hit revenue.

The global broker made a net profit of $US295 million ($413 million) in the three months to September 30.

Overall revenue fell 5% to $US2.7 billion ($3.8 billion), mainly due to a 7% negative impact from foreign currency conversions.

Unfavourable currency movements had a $US30 million ($42 million) impact on pre-tax earnings, with Aon Risk Solutions taking a $US25 million ($35 million) hit.

However, Aon is upbeat it can finish the year strongly.

“In our seasonally weakest quarter, our results reflect organic revenue growth and operating margin expansion across both segments… despite the impact of unfavourable foreign currency translation and macroeconomic challenges,” President and CEO Greg Case said.

“Driven by our industry-leading portfolio and investments across data and analytics, we expect a strong fourth quarter and finish to the year across each of our key metrics, further positioning the firm for free cashflow generation and shareholder value creation.”

Aon Risk Solutions revenue fell 8% to $US1.7 billion ($2.4 billion), squeezed by an 8% unfavourable currency conversion.

Retail organic revenue increased 2%, with New Zealand and Asia registering a 1% rise in international organic revenue.

Reinsurance organic revenue fell 4% due to unfavourable market conditions worldwide, a modest decline in facultative placements and unfavourable timing.